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Well, if you consider waves as small jolts then there are at least 4 or more surfaces of waves/jolts.
Surface waves travel slower than body waves.
You are too close to the surface from which the sound waves are reflected. As a result you brain cannot distinguish between the original sound waves and the reflexted sound waves (the echo).
Radio waves will be reflected by any surface where the electromagnetic properties of the space change. e.g. moving from free space into solid material.
Its base is a flat surface
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